#pragma once

#include <fcntl.h>
#include <stdarg.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>

#include <iostream>

#define SIZE 1024

#define Info 0
#define Debug 1
#define Warning 2
#define Error 3
#define Fatal 4

#define Screen 1
#define Onefile 2
#define Classfile 3

#define LogFile "log.txt"

class Log
{
public:
  Log()
  {
    printMethod = Screen;
    path = "./log/";
  }
  void Enable(int method) { printMethod = method; }
  std::string levelToString(int level)
  {
    switch (level)
    {
    case Info:
      return "Info";
    case Debug:
      return "Debug";
    case Warning:
      return "Warning";
    case Error:
      return "Error";
    case Fatal:
      return "Fatal";
    default:
      return "None";
    }
  }

  void printLog(int level, const std::string &logtxt)
  {
    switch (printMethod)
    {
    case Screen:
      std::cout << logtxt << std::endl;
      break;
    case Onefile:
      printOneFile(LogFile, logtxt);
      break;
    case Classfile:
      printClassFile(level, logtxt);
      break;
    default:
      break;
    }
  }
  void printOneFile(const std::string &logname, const std::string &logtxt)
  {
    std::string _logname = path + logname;
    int fd = open(_logname.c_str(), O_WRONLY | O_CREAT | O_APPEND,
                  0666); // "log.txt"
    if (fd < 0)
      return;
    write(fd, logtxt.c_str(), logtxt.size());
    close(fd);
  }
  void printClassFile(int level, const std::string &logtxt)
  {
    std::string filename = LogFile;
    filename += ".";
    filename += levelToString(level); // "log.txt.Debug/Warning/Fatal"
    printOneFile(filename, logtxt);
  }

  ~Log() {}
  void operator()(int level, const char *format, ...)
  {
    time_t t = time(nullptr);
    struct tm *ctime = localtime(&t);
    char leftbuffer[SIZE];
    snprintf(leftbuffer, sizeof(leftbuffer), "[%s][%d-%d-%d %d:%d:%d]",
             levelToString(level).c_str(), ctime->tm_year + 1900,
             ctime->tm_mon + 1, ctime->tm_mday, ctime->tm_hour, ctime->tm_min,
             ctime->tm_sec);

    va_list s;
    va_start(s, format);
    char rightbuffer[SIZE];
    vsnprintf(rightbuffer, sizeof(rightbuffer), format, s);
    va_end(s);

    char logtxt[SIZE * 2];
    snprintf(logtxt, sizeof(logtxt), "%s %s\n", leftbuffer, rightbuffer);

    // printf("%s", logtxt);
    printLog(level, logtxt);
  }

private:
  int printMethod;
  std::string path;
};

static Log lg;
